Transmission structure for a serial/parallel hybrid vehicle

Abstract

The invention relates to a transmission structure for a hybrid vehicle with an internal combustion engine, a first electric machine, and a second electric machine. In this case, a first electric machine shaft which is assigned to the first electric machine can be driven by a drive shaft which can be driven by the internal combustion engine via a first gear set. In this case, a travel drive gear of a differential gearing of the vehicle can be driven by a second electric machine shaft assigned to the second electric machine via a second gear set. The transmission structure can thereby be compactly designed and in particular, the use of the installation space and/or the efficiency of the electric machines can be improved in that the first gear set has a ring gear with inner teeth and a spur gear which engages with the inner teeth of the ring gear.

What is claimed is: 
     
       1. A transmission structure for an hybrid vehicle with:
 an internal combustion engine; 
 a first electric machine; and 
 a second electric machine; wherein 
 a first electric machine shaft which is assigned to the first electric machine is drivable via a first gear set by an internal combustion engine drive shaft, which internal combustion engine drive shaft is drivable by the internal combustion engine; 
 a travel drive gear of a differential gearing of the vehicle is drivable via a second gear set by a second electric machine shaft which is assigned to the second electric machine; 
 the first gear set has a ring gear with inner teeth and a spur gear which engages with the inner teeth of the ring gear; 
 the drive shaft is connected to rotate with the ring gear, and the spur gear is connected to rotate with the first electric machine shaft; 
 the first electric machine shaft and the second electric machine shaft are arranged coaxial and concentric to each other; 
 the drive shaft is arranged offset parallel to the first and second electric machine shaft; 
 the drive shaft is connectable by a third gear set to the travel drive gear of the differential gearing, and the third gear set comprises outer teeth, wherein the drive shaft is connected to rotate with the outer teeth; 
 the outer teeth are arranged on the ring gear; and wherein 
 an axial offset between the drive shaft and the electric machine shafts is provided, so that the electric machine shafts are arranged at a greater distance from a travel drive shaft than the internal combustion engine drive shaft. 
 
     
     
       2. The transmission structure according to  claim 1 , wherein the transmission structure has an intermediate shaft, wherein a gear connected to rotate with the second electric machine shaft engages in a first intermediate shaft gear of the intermediate shaft, and wherein a second intermediate shaft gear of the intermediate shaft engages in the travel drive gear of the differential gearing. 
     
     
       3. The transmission structure according to  claim 1 , wherein the outer teeth engage in a third intermediate shaft gear of the intermediate shaft, wherein the third intermediate shaft gear is configured as an idler gear, and wherein the third intermediate shaft gear is connectable to rotate with the intermediate shaft by means of a shift element. 
     
     
       4. The transmission structure according to  claim 1 , wherein the transmission structure has a coupling shaft, wherein the outer teeth engage in a first coupling shaft gear of the coupling shaft, wherein a second coupling shaft gear of the coupling shaft engages in the travel drive gear of the differential gearing, and wherein the second coupling shaft gear is connectable to rotate with the first coupling shaft gear by means of a shift element. 
     
     
       5. The transmission structure according to  claim 4 , wherein the distance between one or more of the first and the second electric machine shaft and the coupling shaft is less than the radius one or more of the first and the second electric machine. 
     
     
       6. The transmission structure according to  claim 1 , wherein the transmission structure has a parking lock, wherein the second electric machine shaft or the intermediate shaft is lockable by the parking lock. 
     
     
       7. The transmission structure according to  claim 1 , wherein the first electric machine shaft has a first and second electric machine shaft section, wherein the first and second electric machine section is rotatably connectable to each other and can be disengaged from each other via a clutch. 
     
     
       8. The transmission structure according to  claim 1 , wherein the second electric machine shaft or the intermediate shaft has a parking lock gear. 
     
     
       9. The transmission structure according to  claim 7 , wherein the clutch is a friction clutch.